revisions: refactor handle_revision_opt into parse_revision_opt.

It seems we're using handle_revision_opt the same way each time, have a
wrapper around it that does the 9-liner we copy each time instead.

handle_revision_opt can be static in the module for now, it's always
possible to make it public again if needed.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/revision.h b/revision.h
index c44498e..15dc149 100644
--- a/revision.h
+++ b/revision.h
@@ -1,6 +1,8 @@
 #ifndef REVISION_H
 #define REVISION_H
 
+#include "parse-options.h"
+
 #define SEEN		(1u<<0)
 #define UNINTERESTING   (1u<<1)
 #define TREESAME	(1u<<2)
@@ -119,8 +121,9 @@
 
 extern void init_revisions(struct rev_info *revs, const char *prefix);
 extern int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def);
-extern int handle_revision_opt(struct rev_info *revs, int argc, const char **argv,
-			       int *unkc, const char **unkv);
+extern void parse_revision_opt(struct rev_info *revs, struct parse_opt_ctx_t *ctx,
+				 const struct option *options,
+				 const char * const usagestr[]);
 extern int handle_revision_arg(const char *arg, struct rev_info *revs,int flags,int cant_be_filename);
 
 extern int prepare_revision_walk(struct rev_info *revs);